200121001100 has 18 divisors (see below), whose sum is σ = 434262572604. Its totient is φ = 80048400400.

The previous prime is 200121001057. The next prime is 200121001103. The reversal of 200121001100 is 1100121002.

It is not an unprimeable number, because it can be changed into a prime (200121001103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1000604906 + ... + 1000605105.

It is an arithmetic number, because the mean of its divisors is an integer number (24125698478).

Almost surely, 2^200121001100 is an apocalyptic number.

200121001100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

200121001100 is an abundant number, since it is smaller than the sum of its proper divisors (234141571504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

200121001100 is a wasteful number, since it uses less digits than its factorization.

200121001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001210025 (or 2001210018 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 200121001100 its reverse (1100121002), we get a palindrome (201221122102).

The spelling of 200121001100 in words is "two hundred billion, one hundred twenty-one million, one thousand, one hundred".